Acid reflux

Tiffany
So my daughter has acid reflux. She started on gentlease. Her stools were loose and she was throwing up and spitting up alot. She was changed to a soy based formula. Poops are now like paste (dr says that's good) but her acid reflux doesn't seem any better. She's been on zantac. She threw up yesterday and this morning. Not a lot but it comes out of her nose and she freaks out. The dr doesn't seem too concerned. I am wondering if prevacid would be better. Any suggestions?